Abstract: A mortar applying machine incorporating housing, having a rotatable drive wheel mounted therein, the drive wheel adhered upon a pivot shaft located within the housing, and the drive wheel being disposed through the bottom of the housing for mortar and engagement with the surface of a row of blocks previously applied in the forming of a building wall. Fixedly mounted to the same shaft are a pair of paddles, formed of blades, which assure the proper shifting and movement of the fluid mortar into position within the housing, for passage out of its lower openings, and onto the transverse lands of the row of blocks as previously applied into the building wall. A diverter is provided within the housing to assure that the fluid mortar flows towards the front of the housing with respect to the direction of its movement when depositing a layer of mortar onto a previously laid row of blocks.